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Best Answer: Natural selection can increase the frequencies of alleles if they are advantageous to a species' survival and reproductive abilities.If they somehow produce a phenotype that is not a selective advantage, their frequency will decrease.lleles that give an organism a better chance of survival in their environment, better chance of reproduction, will become more frequent in a population. EX. There are dark and light moths in an environment.
It's not gene pools that have a frequency, but alleles that have a frequency in the gene pool. Alleles are rival variants for the same gene. For instance, if hair colour i â¦ s coded by one gene, then brown hair may be allele A for that gene, while blonde hair is allele B for the same gene.. natural selection-If one organism has an allele that is beneficial to th â¦ e survival of the population it will become selected for and will be mated with. Over time the amount of offspring with this gene/allele will increase while other genes that were not selected for because may decrease.